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\section{Experiment}  A typical arrangement of the Franck-Hertz experiment consists of an electron-emitting filament and a means of accelerating electrons to a variable potential. These accelerated electrons then bombarded atoms of the element, which areusually  in a gaseous state. In order to detect the excitation Accelerated electrons can either collide elastically or inelastically with atoms  of the given element. Slowly moving electrons will collide elastically with  atoms, which will change  the current path of the electron, but not its speed. Since the path  of an  electronbeam can be observed. Specifically, it is expected  that if has undergone an elastic collision changes, the amount of time it takes the electron to reach the \textbf{anode}? increases, but since its speed should not change the kinetic energy of  the electrons should not change. When electrons  have been accelerated to a potential that is equal to the discrete energy of the first excited level, some of collisions with  atoms of the elementwill  become excited, inelastic. The speed of  the bombarding electrons electron  will lose most of their energy, and decrease,which corresponds to a decrease in kinetic energy. Furthmore  the collision is inelastic. If should excite the atom. In order to detect the loss of kinetic energy,  a small retarding potential exists before the anode, which is used to collect remaining electrons, so that  electrons that have lost most of their energy will not be able to overcome it, and thus will not reach the region of collection. This should correspond to a decrease in current of the electron beam. Thus in order to detect the excitation of atoms, and the subsequent drop in kinetic energy, the current of electron beam can be observed.